第六章植物营养

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chapter 6plant nutrition

• leave
  • structure
    • waxy cuticle
      • reduce water loss
    • upper epidermis
      • transparent
        • allow the free passage of light
      • prevent the entry of disease-causing organisms such as bacteria and fungi
    • palisade layer
      • palisade cell
        • tall and thin
        • have a lot of chlorophlly
          • main place to take photosynthesis
    • spongy layer
      • air space
        • to store the gas which produced by photosynthesis
        • Steam which needed in photosynthesis
    • vascular bundle
      • xylem
        • deliver water and mineral salts
      • phloem
        • deliver the organic products of photosynthesis
    • lower epidermis
    • stoma
      • guard cell
        • gas exchange
  • photosynthesis experimentiodine test for starch
    • temperature
      • control other factors
      • two leaves in different temperature
    • carbon dioxide concentration
      • control other factors
      • lime water to blocek CO2
    • sun light
      • control other factors
      • black paper to cover the leave
      • in a same leave
    • chlorophlly
      • find a variegated leave
• photosynthesis
  • 6CO2+6H2O-----C6H12O6+6O2
    • need sunlight and chlorophlly
  • influence factorrate of photosynthesis
    • temperature
      • similar to the enzyme
    • carbon dioxide concentration
    • light intensity
      • control other factors
      • change the distence of lamp to theleave
      • record the gas bubble speed
  • limit factors
• ions
  • nitrigen
    • to form protiens
  • magnisian
    • to form chlorophlly
• nutritions
  • glucose
    • make starch tostore energy
      • iodine test
        • positiveblue-black
        • nagetivebrown
    • make cellulose tobuild cellwall
    • used for respriation
      • 6O2+C6H12O6------6CO2+6O2
    • sucrose for transport in the ploem
    • nectar to attract insects for pollination